For prophylactic tuberculosis treatment, isoniazid needs to be taken alone for six to eight months, or three months if combined with rifampicin. If treating tuberculosis, it needs to be taken in combination with the other three drugs for at least six months. If drug resistance occurs, the treatment time may be prolonged, and the exact time should be judged according to the patient’s condition. Isoniazid tablets are mainly used for various types of tuberculosis and other diseases, the specific dosage time also needs to be based on the patient’s condition, if the patient’s condition is more serious, it is necessary to follow the doctor’s advice to extend the dosage time. Isoniazid tablets are mainly used in combination with other anti-tuberculosis drugs for the treatment of various types of tuberculosis, and can also be used alone for the prevention of various types of tuberculosis. Some patients may experience adverse reactions such as dark-colored urine, unsteady gait or numbness and pins and needles sensation, and poor appetite after taking isoniazid tablets. It is contraindicated in patients who are allergic to isoniazid tablets to prevent allergic symptoms such as generalized red rash and itchy skin. Liver and kidney functions should be tested regularly while taking the drug. Patients who need to treat or prevent tuberculosis are advised to consult the doctor in time and take the medicine as prescribed by the doctor.